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Biomarker library

Infection screening markers

One-time screening recommended for adults. 5 markers, each with the guideline behind it, the ranges, what can affect it, what Passion Health does if it's out of range and when to retest.

Medically reviewed by Anantha Chentha, MD, Co-Founder and Chief Quality Medical Officer · October 30, 2026. Meet our cliniciansNext review: October 2027

In Full Blood WorkFocused panel or single testCalculated
10

Infection screening

One-time screening recommended for adults.

Hepatitis C antibody

Focused panel or single test

Shows past or current hepatitis C infection.

Why it matters: USPSTF recommends screening all adults 18–79 at least once.

Ranges: Reported as reactive or nonreactive.

What can affect it: Past exposure.

If it’s out of range: A reactive result gets a confirmation test; hepatitis C is curable.

When to retest: Only with new risk.

Condition guide: Hepatitis B & C testing online

HIV antigen/antibody

Focused panel or single test

Screens for HIV infection.

Why it matters: USPSTF recommends screening ages 15–65.

Ranges: Reported as reactive or nonreactive.

What can affect it: Recent exposure can be missed in the first weeks.

If it’s out of range: A reactive result gets confirmation and a referral plan.

When to retest: Only with new risk.

Condition guide: STD testing online

Hepatitis B surface antigen

Focused panel or single test

Shows current hepatitis B infection.

Why it matters: Part of the triple panel the CDC (2023) recommends for all adults at least once.

Ranges: Reported as reactive or nonreactive.

What can affect it: Infection status.

If it’s out of range: A reactive result gets further testing and care.

When to retest: Only with new risk.

Condition guide: Hepatitis B & C testing online

Hepatitis B surface antibody

Focused panel or single test

Shows immunity from vaccination or past infection.

Why it matters: Part of the CDC triple panel.

Ranges: Reported as reactive or nonreactive.

What can affect it: Vaccination and past infection.

If it’s out of range: No immunity? Vaccination is offered.

When to retest: Only if advised.

Condition guide: Hepatitis B & C testing online

Hepatitis B core antibody

Focused panel or single test

Shows past or current infection.

Why it matters: Part of the CDC triple panel.

Ranges: Reported as reactive or nonreactive.

What can affect it: Past infection.

If it’s out of range: Read with the other two results.

When to retest: Only if advised.

Condition guide: Hepatitis B & C testing online

Education only. Your clinician interprets results with your history. Reference ranges vary by lab; your report shows ours.

← All 66 markers